Once upon a time, long long ago, I was a good little stitcher who only worked on one, or at most two, projects at a time. Then I fell in among bad people (on the Internet of course) who corrupted me to their bad habits. They showed me new designs, they enabled me, they tempted me and I started a new project, and then another... and then another. In other words, now I have a long WIP (Works in Progress) list. Compared to some (say, my friend Marjan for example), it isn't that bad, but it's still too much for me to keep up with.
I've come up with a rotation plan that suits me, where I've divided all my WIPs into six categories and I work on one project out of each category. I then move to the next category and work on a project from that one for set time. For me, set time is ten hours.